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EDACS: Better EA Patch Message Decoding(WIP);

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lwvmobile
2024-04-12 15:04:06 -04:00
parent 3def1f59e5
commit b7415e1855
1 changed files with 12 additions and 6 deletions
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18
src/edacs-fme.c
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@@ -786,15 +786,21 @@ void edacs(dsd_opts * opts, dsd_state * state)
fprintf (stderr, "%s", KNRM);
}
//Patch Groups
//Patch Groups -- Reverse Engineer WIP from observations and guesswork
else if (mt2 == 0xC)
{
int sourcep = (msg_1 & 0xFFFF);
int patch_site = (msg_2 & 0xFF00000) >> 20; //is site info valid, 0 for all sites? else patch only good on site listed?
int targetp = (msg_2 & 0xFFFF);
//Note: First 9 bits of msg_1 are the mt1 and mt2 bits
int unk1 = (msg_1 & 0x70000) >> 20; //unknown 3 bit value preceeding the SGID
int sgid = (msg_1 & 0xFFFF); //patched supergroup ID
fprintf (stderr, "%s", KYEL);
fprintf (stderr, " Patch :: Site [%02X][%03d] Source [%05d] Target [%05d]", patch_site, patch_site, sourcep, targetp);
int ssn = (msg_2 & 0xFF00000) >> 20; //this value seems to incrememnt based on SGID, so assigning 8-bit as the SSN
int unk2 = (msg_2 & 0xF0000) >> 16; //unknown 4 bit value preceeding 20-bit target value of patch
int target = (msg_2 & 0xFFFFF); //target group or individual ID (20-bit) to include in supergroup
fprintf (stderr, "%s", KMAG); //just make it stick out for now
fprintf (stderr, " Patch :: SSN: %03d; SGID: %05d; Target: %07d;", ssn, sgid, target);
fprintf (stderr, " UNK1: %X;", unk1); //this value seems to always be zero
fprintf (stderr, " UNK2: %X;", unk2); //this value seems to always be zero
fprintf (stderr, "%s", KNRM);
}
//Serial Number Request (not seen in the wild, see US patent 20030190923, Figure 2b)